strspn() function in C++

In this guide, you will learn what is strspn() function is in C++ programming and how to use it with an example.

1. strspn() Function Overview

The strspn() function, which is part of the <cstring> library in C++, determines the length of the initial segment of the first given string that consists entirely of characters present in the second given string.

Signature:

size_t strspn(const char* str1, const char* str2);

Parameters:

- str1: The main string in which the search is performed.

- str2: The string containing characters to be matched against str1.

2. Source Code Example

#include <iostream>
#include <cstring>

int main() {
    const char* string = "123abcDEF";
    const char* match_chars = "1234567890";

    size_t length = strspn(string, match_chars);

    std::cout << "Length of the initial segment of 'string' containing only characters from 'match_chars' is: " << length << std::endl;

    return 0;
}

Output:

Length of the initial segment of 'string' containing only characters from 'match_chars' is: 3

3. Explanation

1. The <iostream> header is included for standard input/output and <cstring> for the strspn() function.

2. Two strings are initialized: string and match_chars. We aim to determine the length of the initial segment of string that contains only characters present in match_chars.

3. The strspn() function is used to find the length of the said segment.

4. The result is then displayed.

The strspn() function is especially helpful when trying to analyze a string's composition based on specific characters or class of characters, like determining the length of the numeric prefix of a string.


Related C++ Source Code Examples:

memcpy() function in C++ memmove() function in C++ memchr() function in C++ memcmp() function in C++ memset() function in C++ strcpy() function in C++ strcat() function in C++ strncat() function in C++ strlen() function in C++ strncmp() function in C++ strcmp() function in C++ strcoll() function in C++ strchr() function in C++ strspn() function in C++ strcspn() function in C++ strpbrk() function in C++ strstr() function in C++ strtok() function in C++ strerror() function in C++ fopen() function in C++ fclose() function in C++ freopen() function in C++ setbuf() function in C++ fprintf() function in C++ fscanf() function in C++ scanf() function in C++ printf() function in C++ sprintf() function in C++ sscanf() function in C++ fgetc() function in C++ fputc() function in C++ fgets() function in C++ fputs() function in C++ fread() function in C++ fwrite() function in C++ malloc() function in C++ realloc() function in C++ calloc() function in C++ free() function in C++ rand() function in C++ exit() function in C++ abort() function in C++ system() function in C++ bsearch() function in C++ qsort() function in C++ atoi() function in C++ atol() function in C++ atof() function in C++ strtod() function in C++ strtol() function in C++ abs() function in C++ clock() function in C++ time() function in C++ difftime() function in C++ mktime() function in C++ asctime() function in C++ ctime() function in C++ localtime() function in C++ strftime() function in C++ iscntrl() function in C++ isalnum() function in C++ isalpha() function in C++ isblank() function in C++ iscntrl() function in C++ isdigit() function in C++ islower() function in C++ isupper() function in C++ tolower() function in C++ toupper() function in C++ Stack Implementation in CPP Queue Implementation in CPP Deque Implementation in CPP Priority Queue Implementation in CPP Linked List Implementation in C++ Doubly Linked List Implementation in CPP Circular Linked List Implementation in CPP Binary Tree Implementation in CPP Binary Search Tree Implementation in CPP Hash Table Implementation in CPP AVL Tree Implementation in CPP Bubble Sort Algorithm in CPP Selection Sort Implementation in CPP Insertion Sort Algorithm in CPP Merge Sort Algorithm in CPP Quick Sort Algorithm in CPP Heap Sort Algorithm in CPP Shell Sort Algorithm in CPP Linear Search Algorithm in CPP Binary Search Implementation in CPP C++ Singleton Design Pattern Example C++ Factory Method Pattern Example C++ Abstract Factory Pattern Example C++ Builder Pattern Example C++ Prototype Design Pattern Example C++ Adapter Design Pattern Example C++ Bridge Pattern Example C++ Composite Pattern Example C++ Decorator Pattern Example C++ Facade Pattern Example C++ Flyweight Design Pattern Example C++ Proxy Pattern Example C++ Chain of Responsibility Pattern Example C++ Command Design Pattern Example C++ Interpreter Design Pattern Example C++ Iterator Design Pattern Example C++ Mediator Pattern Example C++ Memento Pattern Example C++ Observer Pattern Example C++ State Pattern Example C++ Strategy Pattern Example C++ Template Method Design Pattern Example C++ Visitor Design Pattern Example

Comments

Post a Comment